package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import javassist.LoaderClassPath;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service

public class ShoppingCartServiceImpl implements ShoppingCartService {


    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车中的商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list=shoppingCartMapper.list(shoppingCart);
        //如果已经存在，只需要数量加1
        if(list!=null&&list.size()>0){
            ShoppingCart cart=list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);
        }
        //如果不存在，需要插入数据
        else{

            //判断本次添加到购物车的是菜品还是套餐
            Long dishId=shoppingCartDTO.getDishId();
            if(dishId!=null){
                //本次添加到购物车的是菜品
                Dish dish=dishMapper.getbyId(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }


            else{
                //本次添加到购物车的是套餐
                Long setmealId=shoppingCartDTO.getSetmealId();
                Setmeal setmeal=setmealMapper.getBysetmealId(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());

                shoppingCart.setAmount(setmeal.getPrice());

            }
        }
        shoppingCart.setNumber(1);
        shoppingCart.setCreateTime(LocalDateTime.now());
        shoppingCartMapper.insert(shoppingCart);
    }

    /**
     * 查询购物车
     * @param currentId
     * @return
     */
    public List<ShoppingCart> selectshoppingCart(Long currentId) {
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        return shoppingCartMapper.list(shoppingCart);
    }

    /**
     * 清楚购物车
     */
    public void clean() {
        shoppingCartMapper.clean(BaseContext.getCurrentId());
    }

    /**
     * 删除购物车中的一个商品
     * @param shoppingCartDTO
     */
    public void sub(ShoppingCartDTO shoppingCartDTO) {

        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list=shoppingCartMapper.list(shoppingCart);

        ShoppingCart cart=list.get(0);
        if(cart.getNumber()==1)
        {
            shoppingCartMapper.delereById(cart);
        }
        else{
            cart.setNumber(cart.getNumber()-1);
            shoppingCartMapper.updateNumberById(cart);
        }



    }
}
